Main
Flue Resonance or Combustion Noise
Boiler is very noisy with whistling or howling sounds from the flue
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect flue length or configuration, Loose flue joints, Wind effects on terminal, Incorrect gas/air ratio
How to Fix / Troubleshooting
Safety: Abnormal combustion noise can indicate unsafe operation. Do not ignore persistent whistling or roaring.
- Check flue terminal: Ensure no decorative covers, bird guards, or obstructions have been added that are not approved by Main.
- Note wind conditions: If noise occurs only in high winds, wind effects on the terminal may be contributing.
- Engineer tasks:
- Inspect the entire Main flue system for correct assembly, support, and sealing.
- Verify flue length and number of bends are within Main’s limits.
- Perform combustion analysis and adjust gas valve if required.
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Repair Difficulty
Hard
4/5
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